An entheogen ("generating the divine within") is a psychoactive substance used in a religious, shamanic, or spiritual context. Entheogens can supplement many diverse practices for transcendence, and revelation, including meditation, psychonautics, psychedelic and visionary art, psychedelic therapy, and magic.

Entheogens have been used in a ritualized context for thousands of years; their religious significance is well established in anthropological and modern evidences. Examples of traditional entheogens include: peyote, psilocybin mushrooms, uncured tobacco, cannabis, ayahuasca, Salvia divinorum, Tabernanthe iboga, Ipomoea tricolor, and Amanita muscaria. With the advent of organic chemistry, there now exist many synthetic substances with similar psychoactive properties, many derived from these plants. Many pure active compounds with psychoactive properties have been isolated from these organisms and chemically synthesized, including mescaline, psilocybin, DMT, salvinorin A, ibogaine, ergotamine, and muscimol, respectively. Semi-synthetic (e.g. LSD derived usually derived from ergotamine) and synthetic substances (e.g. DPT used by the Temple of the True Inner Light and 2C-B used by the Sangoma) have also been developed. Entheogens may be compounded through the work of a shaman or apothecary in a tea, admixture, or potion like ayahuasca or bhang.

More broadly, the term entheogen is used to refer to any psychoactive substances when used for their religious or spiritual effects, whether or not in a formal religious or traditional structure. This terminology is often chosen to contrast with recreational use of the same substances. Studies such as the Marsh Chapel Experiment have documented reports of spiritual experiences from participants who were administered psychoactive substances in controlled trials. Ongoing research is limited due to widespread drug prohibition, however some countries have legislation that allows for traditional entheogen use.

You cannot be improved? I disagree, there is ALWAYS room to better one's self, whether one is willing to admit it or not. I do appreciate the uplifting words but at the same time I feel like that particular sentence discourages the idea of personal growth.